CURRENT BAND CONDX = Solar-terrestrial indices for 23 September follow. Solar flux 81 and estimated planetary A-index 5. The estimated planetary K-index at 0900 UTC on 24 September was 1. No space weather storms were observed for the past 24 hours. No space weather storms are predicted for the next 24 hours.

ALERT CONDITION: WHISKY ( WHITE )

Sunday, September 24, 2017 - 09:46 GMT - UPDATE # 20

OPERATIONAL FORECAST. - GEOMAGNETIC FIELD. The geomagnetic field is expected to be at quiet to active levels on days one and two (24-25 Sep) with quiet to unsettled levels on day three (26 Sep) due to CH HSS effects. .- SOLAR ACTIVITY. Solar activity is likely to be at low levels with a slight chance for M-class (R1-R2, Minor-Moderate) flares on days one through three (24-26 Sep).

G/S/R SCALES USED     DEF'S USED     LIGHTNING - (QRN)


HF OPERATIONAL BRIEFING - CURRENT CONDITIONS IN DETAIL

CURRENT SOLAR CONDITIONS


VISIBLE DISK

 


SOLAR MAGNETOGRAM

 


NEAR INFRARED

 


SUNSPOT TRACKING

 

Solar activity was at very low levels. A B3 flare was observed at 23/0603 UTC from the east limb near S07, likely the return of old Region 2673 (S09, L=119), however no spots were visible at the time of this report. Slight growth was observed in Region 2681 (S13E32, Cso/beta). No Earth-directed CMEs were observed in available satellite imagery.


RADIO BLACKOUTS - SOLAR STORMS - GEOMAGNETIC STORMS

The geomagnetic field was quiet.


"D" LAYER - HF ATTENUATION LEVELS


AURORA  -   NORTH POLE  - SHORT PATH